Fan not working on Toshiba U500 series, but always on after suspend. Laptop overheating.

Reviving a known issue since Ubuntu 10.04 that has still not been fixed in Ubuntu 11.04 (both i386 and amd64 have been tested)

Models
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* Toshiba Satellite U500 series
* Toshiba Satellite Pro L510
(same issue exists some other Toshiba series, please add your model here if you're also impacted and I will complete my description)

Symptoms
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* The fan doesn't start at all and provokes computer overheating + immediate shutdown
* The fan starts running at full speed after a suspend-to-ram and never stops (noisy)

Some hints
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*!!!* This issue was FIXED on Debian 6 "Squeeze" i386 + amd64 releases (but was still present in Debian 5)
>> Fixing this issue also fixed related other issues such as screen brightness and sound FN-buttons

* The issue is also present on CentOS and Fedora latest releases
* Seems to be DSDT related (see below)
* The module "toshiba_acpi" can't be loaded (No such device)

What has been unsuccessfully tried
------------------------------------------------

* Adding "acpi.power_nocheck=1" to boot options doesn't work anymore since 10.04
* Adding "quiet acpi_osi=\"Linux\"" to boot options doesn't work anymore since 10.04

What has been "successfully" tried
---------------------------------------------

* Recompiling the DSDT table (after correcting some errors) and recompiling the kernel including it solves the problem partially (the fan doesn't start on some computer boots but works fine when it does)

Useful links
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* Ubuntu forums - Toshiba Laptop U500 running hot
http://ubuntuforums.org/showthread.php?t=1473317

I have never submitted any bug report before so please indicate me which relevant file or information should be added here.

#Ubuntu 11.04 "Natty Narwal" 2.6.38 kernel